Will inventory & sales automatically update when I replace client's current code with my new theme?

17 1 1

I am doing a redesign for a client, and the client's site was so cluttered that I decided to just start with my own development store and theme code and just import the client's products and collections to help with development. Now I am getting close to being done, and I don't want to transfer the store to the client--I just want to replace her theme code with mine. When I do that, will all of the inventory and things that are on sale automatically update? Are there any other things I need to make sure I do when I replace her theme code so her live store keeps working right?

Thanks in advance for your help, new to Shopify.